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NBC 7's report on the discovery of Jessica Barrymore in a parked car in National City on July 29, 2014. (Published Wednesday, Jul 30, 2014)

Updated at 8:24 PM EST on Wednesday, Jul 30, 2014

A woman believed to be the half-sister of Hollywood actress and producer Drew Barrymore was found dead outside San Diego.

Jessica Barrymore, 47, was found in her car parked along Hoover Avenue in National City just after 6 a.m. on Tuesday, July 29.

Resident Andres Alonzo was inside his home when he heard a car pull up outside. He saw that a female driver had parked strangely and said he wanted to step in to help but his grandmother warned him not to touch the car.

“Something was wrong with her when she parked right here,” Alonzo told NBC 7 Wednesday.

Several neighbors also noticed the car and someone called police to report it.

Officials have not released the cause of death.

The county medical examiner's report states that firefighters confirmed her death without medical intervention.

In a statement provided to NBC 7 from E! Entertainment, Drew Barrymore said, “Although I only met her briefly, I wish her and her loved ones as much peace as possible and I'm so incredibly sorry for their loss.”

The cover photo of Jessica Barrymore from FacebookPhoto credit: Facebook

On the San Diego County Medical Examiner’s report, Jessica Barrymore's birthday is listed as July 31, 1966.